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    <title>Document</title>
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  <body>
    <script>
      const obj = {
        281: {
          name: "吴艳",
          group: 1,
          score: [53, 87, 100, 100, null],
        },
        282: {
          name: "江芳",
          group: 2,
          score: [83, 50, 70, null, null],
        },
        283: {
          name: "杜强",
          group: 3,
          score: [87, 38, 57, null, null],
        },
        284: {
          name: "林军",
          group: 4,
          score: [40, 94, 68, null, null],
        },
        285: {
          name: "汪磊",
          group: 5,
          score: [80, 77, 88, null, null],
        },
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      // console.log(obj)
      // Object.keys()获取对象的属性名 返回值是数组
      // Object.values()获取对象的属性值 返回值是数组
      const arr = Object.keys(obj)
      // console.log(arr)
      arr.map(item => {
        // console.log(item)
        console.log(obj[item].name)
      })
    </script>
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